chore: Add PR checker workflow (#2188)

.github/pr-title-checker-config.json

@@ -0,0 +1,17 @@
+{
+  "LABEL": {
+    "name": "Title Needs Formatting",
+    "color": "FF5733"
+  },
+  "CHECKS": {
+    "prefixes": ["chore: ", "refactor: ", "perf: ", "test: ", "docs: "],
+    "regexp": "(fix|feat)\\((all|analytics|api|auth|core|datastore|geo|predictions|storage)\\): ",
+    "regexpFlags": "",
+    "ignoreLabels" : []
+  },
+  "MESSAGES": {
+    "success": "All OK",
+    "failure": "Your title is not formatted correctly. Please see https://github.com/aws-amplify/amplify-android/blob/main/CONTRIBUTING.md#pull-request-guidelines for guidelines.",
+    "notice": ""
+  }
+}

.github/workflows/pr_title_checker.yml

@@ -0,0 +1,21 @@
+# Runs a check to verify PRs have a valid title
+
+name: "PR Title Checker"
+on:
+  pull_request_target:
+    types:
+      - opened
+      - edited
+      - synchronize
+      - labeled
+      - unlabeled
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: thehanimo/pr-title-checker@v1.3.5
+        with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          pass_on_octokit_error: false
+          configuration_path: ".github/pr-title-checker-config.json"

CONTRIBUTING.md

@@ -428,10 +428,20 @@ Copy-paste this, and complete the workflow in the UI. It will invite you to
 ### Pull Request Guidelines
 - The title of your PR must be descriptive to the specific change.
 - The title of your PR must be of below format since next release version is determined from PR titles in the commit history.
-	- For a bugfix: `fix(category): description of changes`
-	- For a feature: `feat(catgory): add awesome feature`
-	- Everything else: `chore: fix build script`
-	- Eg. `fix(auth): throw correct auth exception for code mismatch`. Refer https://github.com/aws-amplify/amplify-android/pull/1370
+    - For a bugfix: `fix(category): description of changes`
+    - For a feature: `feat(catgory): add awesome feature`
+    - Everything else: `chore: fix build script`
+    - Valid categories are:
+      - all
+      - analytics
+      - api
+      - auth
+      - core
+      - datastore
+      - geo
+      - predictions
+      - storage
+    - Eg. `fix(auth): throw correct auth exception for code mismatch`. Refer https://github.com/aws-amplify/amplify-android/pull/1370
 - No period at the end of the title.
 - Pull Request message should indicate which issues are fixed: `fixes #<issue>` or `closes #<issue>`.
 - If not obvious (i.e. from unit tests), describe how you verified that your change works.